Snap fastener and conveyor belt: what they have in common

1. Step 1. Snap fastener — works like — Button. A fastener.
2. Step 2. Button — works like — Zip. An alternative way of fastening.
3. Step 3. Zip — is part of — Bag. A zip.
4. Step 4. Bag — is made of — Leather. Leather.
5. Step 5. Leather — is material for — Conveyor belt. The first belts were leather.

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